Democratic presidential candidate and former U.S. Secretary of State Hillary Clinton speaks at the National Association of Latino Elected and Appointed Officials' (NALEO) 32nd Annual Conference at the Aria Resort & Casino at CityCenter on June 18, 2015 in Las Vegas, Nevada. Ethan Miller/Getty Images Hillary Rodham Clinton's presidential campaign says the former secretary of state will testify Oct. 22 before the House committee investigating the deaths of four Americans in the attacks in Benghazi, Libya, in 2012.

The investigation into the deaths of the U.S. ambassador and three others has grown into a political fight over Clinton's emails and private computer server. It's likely to shadow Clinton's 2016 presidential campaign.

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